/Engine/Source/Runtime/Core/Public/Containers/LockFreeFixedSizeAllocator.h
Thread safe, lock free pooling allocator of fixed size blocks that never returns free space until program shutdown. alignment isn't handled, assumesFMemory::Mallocwill work
template<int32 SIZE, int TPaddingForCacheContention, typename TTrackingCounter, bool AllowDisablingOfTrim> class TLockFreeFixedSizeAllocator